Trying to see if I got an issue. Mine stays at 19 in park
Your vacuum should be between 15-20 inHg at idle.
This is why you shouldn’t cut corners on a $60k truck with things like a BOV spacer.
My stock gauge typically shows 0 boost and 0 vacuum when idling in park.
0 vacuum at idle means a boost leak. You should be between 15-20 inhg at idle.
I don’t have exact numbers, just the gauge that Ford provides. It stays in the middle at idle, moves to the right when I’m in boost, and shifts to the left after I let off the gas. I assumed the middle was zero, but I guess that wasn’t the right assumption.